You can just add the border-radius rule... there wont be issues.
<div style="max-height: 600px; max-width: 700px; border-radius: 10px;"></div>
or...
<div class="med-round"></div>
+
.med-round {
max-height: 600px;
max-width: 700px;
border-radius: 10px;
}